Tantumblogo on the The Blog for Dallas Area Catholics has a post Liberalism is an ideology too .It reminds me of how he and Pat Archbold have accepted the Cardinal Marchetti letter of 1949.They have approved an ideology, a new doctrine.They may not realize it.
This is the new theology based on an irrationality, a factual error. This is liberalism.
This is the modernism approved also by the Society of St.Pius X (SSPX) when they do not see the contradiction with Tradition in the Letter of the Holy Office, which is the basis for heresy in the Church.
In general heresy is being endorsed in the Church and it is considered magisterial.